Daring Do and The Obsidian Feather

You eventually decide on listening to the local gossips. The ponies around here always have their nose buried in something that doesn't concern them. You don your A.K Yearling disguise and trot into town. You know all the best places to hear gossip. You buy a snack and take a seat on the fountain's edge while you eat it. As ponies pass by, you overhear all sorts of rumours, ranging from simple matters of appearance to accusations of cheating.

After almost an hour of sitting pretending to be enjoying lunch by the fountain, you finally hear something worth paying attention to.

"...in the desert..." you hear a mare say. You strain your ears to make out the rest of her conversation.

"I hear it leads to something really valuable," says her friend.

"Oh, but isn't there only half of it? How's anyone supposed to work with that?" replies the first mare.

"Torn in half...sounds like something out of a Daring Do book, doesn't it?" says her friend. The pair share a laugh before their topic of conversation shifts to something that doesn't concern you.

Now you have a lead. But you need more information. The desert is huge, and you can't be sure if it's even the treasure map that the two mares were talking about. For all you know, it could be something completely different. You're faced with a choice. You can interrogate the two mares, you can shadow them and see if they talk about it any more, or you can go straight to the desert and hope for the best.

What do you do?

Interrogate the mares.

Shadow the mares.

Go to the desert.